White Papers

Semantic Query Optimization for Processing XML Streams With Minimized Memory Footprint

Tags: data

Overview XQuery evaluation over XML streams requires the temporary buffering of XML elements. This paper presents a semantic query optimization solution to minimize memory footprint during XQuery evaluation by exploiting schema knowledge. The focus is on one particular class of constraints, namely, the Pattern Non-Occurrence (PNO) constraints for XML streams conforming to pre-defined DTDs. PNO constraints facilitate the early release of buffered data (early buffer release) or possibly avoid to ever store the data (buffer avoidance), thus achieving a minimized memory foot-print. An automaton-based technique is developed to detect PNO constraints at runtime.

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Publisher: Worcester Polytechnic Institute
File Format: PDF
Date Published: Dec 24, 2008
Format: White Papers
Topics: Web Services, XML, Programming Languages

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